Rear bumper for an automobile



FIG. 1 is a perspective view of the front and one side of a rear bumper for an automobile showing our new design;

FIG. 2 is a perspective view of the front and opposite side thereof to an enlarged scale;

FIG. 3 is a greatly enlarged side elevational view thereof;

FIG. 4 is a greatly enlarged top plan view thereof; and

FIG. 5 is a greatly enlarged front elevational view thereof.

The broken lines in the drawings are for illustrative purposes only. 

The ornamental design for a rear bumper for an automobile, as shown and described. 